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Cornell Dubilier BF-50 Capacitor Analyzer

In order to verify the vintage capacitor collection I slowly attained all perform to spec, I started to look for capacitor analyzers. The most well known is the Sprague TEL-OHMIKE series. Trying to find one of the Sprague designs at a reasonable price is difficult though. The TEL-OHMIKE brings $175-$250 on Ebay and I wasn’t trying to spend quite that much. I started to look at other well known capacitor brands and landed on Cornell Dubilier’s BF-50 model. I managed to find the BF-50 fully functional and shipped to my door for less than $75!



The BF-50 allows you to test for the following:

  • Open or Intermittent Capacitors
  • Shorted Capacitors
  • Leaky Capacitors
  • Capacitance Value
  • Grounded Capacitors

The BF-50 uses two transformers and two electron tubes. The 12A7 is the rectifier and the amplifier. The other is the 6E5 (“Magic Eye” ) which gives you the readings on the tests performed (listed above). The eye either opens/closes a specific amount or it will flash a specific amount per second to indicate the reading.

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Computer Engineering student with a background in IT. Such as dealing with large scale network infrastructure upgrades at Lowe's HQ and former lead hardware tech for the NC Government. My specialty has shifted over to audio hardware and vintage hardware re-certifications.

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